Rich Gossweiler, Maryam Kamvar, Shumeet Baluja. What s up CAPTCHA?: a CAPTCHA based on image orientation. In Juan Quemada, Gonzalo León, Yoëlle S. Maarek, Wolfgang Nejdl, editors, Proceedings of the 18th International Conference on World Wide Web, WWW 2009, Madrid, Spain, April 20-24, 2009. pages 841-850, ACM, 2009. [doi]
@inproceedings{GossweilerKB09,
title = {What s up CAPTCHA?: a CAPTCHA based on image orientation},
author = {Rich Gossweiler and Maryam Kamvar and Shumeet Baluja},
year = {2009},
doi = {10.1145/1526709.1526822},
url = {http://doi.acm.org/10.1145/1526709.1526822},
tags = {rule-based},
researchr = {https://researchr.org/publication/GossweilerKB09},
cites = {0},
citedby = {0},
pages = {841-850},
booktitle = {Proceedings of the 18th International Conference on World Wide Web, WWW 2009, Madrid, Spain, April 20-24, 2009},
editor = {Juan Quemada and Gonzalo León and Yoëlle S. Maarek and Wolfgang Nejdl},
publisher = {ACM},
isbn = {978-1-60558-487-4},
}